x(x+20)=600

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Solution for x(x+20)=600 equation:


Simplifying
x(x + 20) = 600

Reorder the terms:
x(20 + x) = 600
(20 * x + x * x) = 600
(20x + x2) = 600

Solving
20x + x2 = 600

Solving for variable 'x'.

Reorder the terms:
-600 + 20x + x2 = 600 + -600

Combine like terms: 600 + -600 = 0
-600 + 20x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '600' to each side of the equation.
-600 + 20x + 600 + x2 = 0 + 600

Reorder the terms:
-600 + 600 + 20x + x2 = 0 + 600

Combine like terms: -600 + 600 = 0
0 + 20x + x2 = 0 + 600
20x + x2 = 0 + 600

Combine like terms: 0 + 600 = 600
20x + x2 = 600

The x term is 20x.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20x + 100 + x2 = 600 + 100

Reorder the terms:
100 + 20x + x2 = 600 + 100

Combine like terms: 600 + 100 = 700
100 + 20x + x2 = 700

Factor a perfect square on the left side:
(x + 10)(x + 10) = 700

Calculate the square root of the right side: 26.457513111

Break this problem into two subproblems by setting 
(x + 10) equal to 26.457513111 and -26.457513111.

Subproblem 1

x + 10 = 26.457513111 Simplifying x + 10 = 26.457513111 Reorder the terms: 10 + x = 26.457513111 Solving 10 + x = 26.457513111 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = 26.457513111 + -10 Combine like terms: 10 + -10 = 0 0 + x = 26.457513111 + -10 x = 26.457513111 + -10 Combine like terms: 26.457513111 + -10 = 16.457513111 x = 16.457513111 Simplifying x = 16.457513111

Subproblem 2

x + 10 = -26.457513111 Simplifying x + 10 = -26.457513111 Reorder the terms: 10 + x = -26.457513111 Solving 10 + x = -26.457513111 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = -26.457513111 + -10 Combine like terms: 10 + -10 = 0 0 + x = -26.457513111 + -10 x = -26.457513111 + -10 Combine like terms: -26.457513111 + -10 = -36.457513111 x = -36.457513111 Simplifying x = -36.457513111

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.457513111, -36.457513111}

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